/*
 * GIT - The information manager from hell
 *
 * Copyright (C) Eric Biederman, 2005
 */
#include "cache.h"
#include "exec_cmd.h"

static const char var_usage[] = "git var [-l | <variable>]";

struct git_var {
        const char *name;
        const char *(*read)(int);
};
static struct git_var git_vars[] = {
        { "GIT_COMMITTER_IDENT", git_committer_info },
        { "GIT_AUTHOR_IDENT",   git_author_info },
        { "", NULL },
};

static void list_vars(void)
{
        struct git_var *ptr;
        for(ptr = git_vars; ptr->read; ptr++) {
                printf("%s=%s\n", ptr->name, ptr->read(IDENT_WARN_ON_NO_NAME));
        }
}

static const char *read_var(const char *var)
{
        struct git_var *ptr;
        const char *val;
        val = NULL;
        for(ptr = git_vars; ptr->read; ptr++) {
                if (strcmp(var, ptr->name) == 0) {
                        val = ptr->read(IDENT_ERROR_ON_NO_NAME);
                        break;
                }
        }
        return val;
}

static int show_config(const char *var, const char *value, void *cb)
{
        if (value)
                printf("%s=%s\n", var, value);
        else
                printf("%s\n", var);
        return git_default_config(var, value, cb);
}

int main(int argc, char **argv)
{
        const char *val;
        int nongit;
        if (argc != 2) {
                usage(var_usage);
        }

        git_extract_argv0_path(argv[0]);

        setup_git_directory_gently(&nongit);
        val = NULL;

        if (strcmp(argv[1], "-l") == 0) {
                git_config(show_config, NULL);
                list_vars();
                return 0;
        }
        git_config(git_default_config, NULL);
        val = read_var(argv[1]);
        if (!val)
                usage(var_usage);

        printf("%s\n", val);

        return 0;
}